William sawyer



W. SAWYER. Electric-Lamp.

No. 227,389. Patent ed May 11,1880.

Mom/58 5a //v1 /v 7'05.

FL PEPERSIFHDTDUTROGRIPHERLWASHINGTON. D. C.

UNITED STATES PATENT GFFICE.

WILLIAM SAWYER, OF NEW YORK, N. Y., ASSIGNOB TO THE EASTERN ELEG- TRIG MANUFACTURING COMPANY, OF MIDDLETOWN, CONN.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 227,389, dated May 11, 1880.

Application filed January 1'7, 1880. I

To all whom it may concern:

Be it known that I, WILLIAM SAWYER, a citizen of the United States. residing at New York, in the county of New York and State of 5 New York, have invented certain new and useful Improvements in Electric Lamps, of which the following is a full, clear, and exact de scription.

My invention relates to that method of electric lighting in which a pencil of carbon hermetically sealed in a glass globe charged with nitrogen gas is rendered incandescentby the passage of the electric current, and has particular reference to the devices used for securing an air-tightjoint at the base of the globe.

Referring to the drawings accompanying and constituting a part of this application, .Figure 1 is a vertical section through the base of the globe; and Figs. 2 and 3 are detail views, illustrating the invention.

The main sealing of the lamp is of the greatest importance as well as difficulty. I

- The glass globe B, which is provided with a flange at its lower extremity, is sunk deeply into the cup A, and the surfaces of contact are accurately grooved together. The globe having been put in its place, as shown, the cup A is set upon a stove or over a Bunsen burner and considerably heated; but as the globe takes its heat gradually from the cup fracture of the glass is avoided. I now, with any suitable utensil, pour melted sealing-wax G in the annular space surrounding the globe to about the depth indicated. The sealing- 3 5 wax having hardened, I next pour in melted bees-wax D to about the depth indicated, and allow the whole to cool. I remark, however, that the bees-wax, although I greatly prefer to use it, may be omitted.

Above the whole I place several closely-fitting soft-rubber or other elastic washers, F, and over these a metal washer, E. The flange 1, grooved as shown in Fig. 3, is last dropped into place, being held there by setting up upon the screws Gr, pointed to fit the groove. The rubber washers are finally compressed by setting down upon the screws H. The joint so prepared is practically hermetical.

Having thus fully described my invention, what I claim as such, and desire to secure by Letters Patent, is-

1. In an electric lamp operating by incandescence, the combination of a globe, B, a cup, A, and compressing mechanism consisting of a flange fixed to the cup A and provided with screws for compressing the material below the flange.

2. The combination of a globe, B, a cup, A, hard cement 0, soft cement D, and mechanism for compressing the same.

3. The combination of a globe, B, a cup, A, hard cement G, soft cement D, elastic material F, and mechanism for compressing the same.

WM. SAWYER.

Witnesses:

WM. Gr. OONKLIN, A1) oLrH FRANKE- 

